Product overview: 792A AC/DC Transfer Standard

• Ultra-high accuracy AC/DC Thermal Transfer Standard with uncertainties as low as ±10 ppm (±5 ppm from NIST).
• 2 mV to 1000V voltage range, 10 Hz to 1 MHz frequency range
• Features a Fluke Calibration solid-state RMS sensor for temperature stability and fast settling time; measurements made in as short as 30 seconds.
• The 792A consists of four units including a Transfer Unit, a Power Pack unit, a 1000V Range Resistor and a Transfer Switch, and is shipped from the factory traceable to national standards with a table of correction factors and uncertainties.

Accurate, fast and easy to use

At the heart of the 792A is the patented Solid-State Thermal RMS sensor, which has been proven in a variety of Fluke Calibration products since 1979. Its output voltage is 2V, compared to the 7 to 10 mV output of traditional thermocouples. That means the 792A exhibits excellent signal-to-noise characteristics and minimal reversal errors as low as 10 ppm relative to input voltage. The 2V output also permits you to make measurements with high resolution so you can use a digital voltmeter rather than a null meter to make transfers. Not only are measurements easier to make, they are more precise as well. And because it is small, the RMS Sensor has very low thermal mass, so the 792A stabilizes in as little as 30 seconds and can be used over a wide temperature range of 11° C to 35° C. The RMS Sensor is designed to be rugged and reliable. Each is built to exacting standards by the Fluke Microelectronics Operation to maintain quality and consistency, part after part.

Fully traceable performance

Each 792A is shipped from Fluke Calibration with a certificate of calibration. Included is a table of correction factors and uncertainties for measured ac/dc differences.

To support the traceability requirements for an instrument as accurate as the 792A, the Fluke Calibration Metrology Department developed a unique system to transfer national laboratory values to the 792A production environment. This system is based on proven techniques developed to maintain a 732A direct voltage standard to within a few parts in 100 million. Statistical treatment of data resulting from successive intercomparisons of virtually identical 792As is used to minimize transfer uncertainties. To achieve even higher performance, you can have the transfer uncertainties of your 792A assigned directly by any national standards organization.

Periodic calibration and recertification is available from Fluke Calibration. This service repeats the original calibration procedure. A new table of correction factors and uncertainties for measured ac/dc differences is returned with your instrument. Order 792A-000.